Abstract
This work has been supported by the European Community as an Integrating Activity “Support of Public and Industrial Research using Ion Beam Technology (SPIRIT)” under EC contract No. 227012. The support of EC funded project BG051PO001/3.3.-05.001 for this publication is gratefully acknowledged. The Marie Curie Fellowship for T. Tsvetkova was also supported by the European Community under the contract PIEF-GA-2009-251845. The help of D. Dimova-Malinovska and O. Angelov with the samples preparation and useful discussions is also gratefully acknowledged.
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